Re: Need help in enable configuration when compile Kernel module

[Ashokkumar G <ashok.sysprogrammer@xxxxxxxxx>]

Dear Silverstri,

I am not sure for which platform you are compiling Kernel.

But for X86(_64) and ARM, CONFIG_VIDEOBUF2_CORE will be selected as a module (will not build into kernel image static), this is the dependency VIDEOBUF2_DMA_CONTIG [=m] && MEDIA_SUPPORT [=m] && HAS_DMA [=y] || VIDEOBUF2_VMALLOC [=m] && MEDIA_SUPPORT [=m] || VIDEOBUF2_DMA_SG [=n] && MEDIA_SUPPORT [=m] || SOC_CAMERA [=m] && MEDIA_SUPPORT [=m] && V4L_PLATFORM_DRIVERS [=y] && VIDEO_V4L2 [=m] && HAS_DMA [=y] && I2C [=y].

select MEDIA_SUPPORT and SOC_CAMERA to build into kernel image static (when you select one of MEDIA_SUPPORT/SOC_CAMERA/VIDEO_V4L2 as build static into kernel, .config will have  CONFIG_VIDEOBUF2_CORE=y instead of CONFIG_VIDEOBUF2_CORE=m)

For ARM board I used Device Drivers->Multimedia Support (make this to build into kernel instead of static)->V4L platform devices (make this to build into kernel instead of static)->Soc Camera Support(make this to build into kernel instead of static).

--
Best Regards
Ashokkumar.G
100 Things can not be taken back. 001. A lost opportunity. 010. A spoken word. 011. A sped arrow. 100. Time spent.

On Thu, Jan 9, 2014 at 7:16 PM, m silverstri <michael.j.silverstri@xxxxxxxxx> wrote:

I am using 3.10.x kernel tree. My kernel module needs config VIDEOBUF2.

That is defined in drivers/media/v4l2-core/Kconfig:

# Used by drivers that need Videobuf2 modules
config VIDEOBUF2_CORE
select DMA_SHARED_BUFFER
tristate

So I put 'CONFIG_VIDEOBUF2_CORE=y' in my Kernel config file and
compile. From the Kconfig it has CONFIG_VIDEOBUF2_CORE has no
dependency and I think adding CONFIG_VIDEOBUF2_CORE=y to my kernel
config should work. I am modify the right kernel config file since I
set other flags like CONFIG_VIDEO_DEV=y and that works.

The generated .config does not contain 'CONFIG_VIDEOBUF2_CORE=y'

and the compilation fails with  a bunch of

undefined reference to `vb2_buffer_done'
undefined reference to `vb2_buffer_done'
undefined reference to `vb2_buffer_done'
undefined reference to `vb2_buffer_done'

I really appreciate if someone can help me with this.

Thank you.

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